What does it mean when someone from the other side hops on board of a Clairvoyant?

It would've been nice with a little more detail about your question, but I think what you are referring to is called "channeling". The only other option is "possession". Channeling is when a being 'channels' into a clairvoyant in order to communicate with the clairvoyant or others.

Possession is when another being takes 'possession' of a persons body, clairvoyant or not.

I too believe it means in loose terms "posession" which can be of anyone not just a medium. As a working medium sometimes when I communicate with spirit they may stand too close, this causes your emotions to heighten and a feeling of uncomfortableness may follow. In this case I ask spirit to step back.

Some mediums are "trance" mediums which means that spirit do hop on board or posess (whichever term you prefer) the person. When done properly this is very impressive to witness as a persons vocal cords are temporarily paralyzed and spirit does take over.....hope that helps you? X.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.